Supplemental Disclosure of Cash Flow Information (Details) - USD ($) $ in Thousands |
6 Months Ended | |
---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
|
Non-cash Investing and Financing Activities from Continuing Operations [Abstract] | ||
Property, plant and equipment acquired with accrued liabilities | $ 37,168 | $ 31,579 |
Supplemental Cash Flow Elements [Abstract] | ||
Interest (net of amounts capitalized) | (67,119) | (65,820) |
Income taxes (paid) refunded | $ (14,837) | $ 1 |